earncont copy

# 🪙 EarnTrack — Peer Reward & Tipping Smart Contract

A minimalistic peer reward system built on Ethereum that allows users to tip peers and track earnings directly on-chain.

Designed for simplicity — no imports, no constructors, and no input parameters in any function.

---

## 📜 Contract Information

- Contract Name: EarnTrack

- Deployed Address: 0xA6CC8eae900CA48E5356cAad528BE62CA97ea33a](https://etherscan.io/address/0xA6CC8eae900CA48E5356cAad528BE62CA97ea33a)

- Network: Ethereum Mainnet (EVM-compatible)

- License: MIT

- Solidity Version: ^0.8.20

---

## 🚀 Overview

EarnTrack introduces a simple, on-chain tipping and earning system that requires no arguments in any function call.

Users can:

- Send ETH as tips.

- Earn and track their on-chain rewards.

- Withdraw their accumulated balance anytime.

- Auto-tip peers simply by sending ETH to the contract address.

---

## 🧩 Core Features

| Function | Description |

|-----------|--------------|

| 💸 tipPeer() | Send ETH to reward a pseudo-random peer. |

| 💰 withdrawEarnings() | Withdraw all your earned ETH. |

| 📊 viewMyEarnings() | View your current on-chain earnings. |

| 🤝 myLastPeer() | Check who you last tipped. |

| ⚡ receive() / fallback() | Sending ETH directly triggers automatic tipping. |

---

## 💻 Full Solidity Code

```solidity

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

contract EarnTrack {

mapping(address => uint256) private earnings;

mapping(address => address) private lastPeer;

uint256 private seed;

function tipPeer() public payable {

require(msg.value > 0, "Send ETH to tip");

address peer = address(uint160(uint256(keccak256(abi.encodePacked(

block.timestamp, msg.sender, seed

)))));

earnings[peer] += msg.value;

lastPeer[msg.sender] = peer;

seed = uint256(keccak256(abi.encodePacked(seed, block.number, msg.sender)));

}

function withdrawEarnings() external {

uint256 amount = earnings[msg.sender];

require(amount > 0, "No earnings to withdraw");

earnings[msg.sender] = 0;

(bool success, ) = msg.sender.call{value: amount}("");

require(success, "Withdraw failed");

}

function viewMyEarnings() external view returns (uint256) {

return earnings[msg.sender];

}

function myLastPeer() external view returns (address) {

return lastPeer[msg.sender];

}

receive() external payable { _autoTip(); }

fallback() external payable { _autoTip(); }

function _autoTip() internal {

if (msg.value > 0) {

(bool success, ) = address(this).call{value: msg.value}(

abi.encodeWithSignature("tipPeer()")

);

require(success, "Auto-tip failed");

}

}

}